[XFS] Given the log a pointer to the AIL

When we need to go from the log to the AIL, we have to go via the
xfs_mount. Add a xfs_ail pointer to the log so we can go directly to the
AIL associated with the log.

SGI-PV: 988143

SGI-Modid: xfs-linux-melb:xfs-kern:32351a
Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>

fs/xfs/xfs_log.c

@@ -572,6 +572,7 @@ xfs_log_mount(
 		cmn_err(CE_WARN, "XFS: AIL initialisation failed: error %d", error);
 		goto error;
 	}
+	mp->m_log->l_ailp = mp->m_ail;
 
 	/*
 	 * skip log recovery on a norecovery mount.  pretend it all
@@ -908,7 +909,7 @@ xfs_log_need_covered(xfs_mount_t *mp)
 	spin_lock(&log->l_icloglock);
 	if (((log->l_covered_state == XLOG_STATE_COVER_NEED) ||
 		(log->l_covered_state == XLOG_STATE_COVER_NEED2))
-			&& !xfs_trans_ail_tail(mp->m_ail)
+			&& !xfs_trans_ail_tail(log->l_ailp)
 			&& xlog_iclogs_empty(log)) {
 		if (log->l_covered_state == XLOG_STATE_COVER_NEED)
 			log->l_covered_state = XLOG_STATE_COVER_DONE;

fs/xfs/xfs_log_priv.h

@@ -404,6 +404,7 @@ typedef struct xlog_in_core {
 typedef struct log {
 	/* The following fields don't need locking */
 	struct xfs_mount	*l_mp;	        /* mount point */
+	struct xfs_ail		*l_ailp;	/* AIL log is working with */
 	struct xfs_buf		*l_xbuf;        /* extra buffer for log
 						 * wrapping */
 	struct xfs_buftarg	*l_targ;        /* buftarg of log */

fs/xfs/xfs_log_recover.c

@@ -2681,7 +2681,7 @@ xlog_recover_do_efi_trans(
 	efip->efi_next_extent = efi_formatp->efi_nextents;
 	efip->efi_flags |= XFS_EFI_COMMITTED;
 
-	spin_lock(&mp->m_ail->xa_lock);
+	spin_lock(&log->l_ailp->xa_lock);
 	/*
 	 * xfs_trans_update_ail() drops the AIL lock.
 	 */
@@ -2710,6 +2710,7 @@ xlog_recover_do_efd_trans(
 	xfs_log_item_t		*lip;
 	__uint64_t		efi_id;
 	struct xfs_ail_cursor	cur;
+	struct xfs_ail		*ailp;
 
 	if (pass == XLOG_RECOVER_PASS1) {
 		return;
@@ -2727,8 +2728,9 @@ xlog_recover_do_efd_trans(
 	 * in the AIL.
 	 */
 	mp = log->l_mp;
-	spin_lock(&mp->m_ail->xa_lock);
-	lip = xfs_trans_ail_cursor_first(mp->m_ail, &cur, 0);
+	ailp = log->l_ailp;
+	spin_lock(&ailp->xa_lock);
+	lip = xfs_trans_ail_cursor_first(ailp, &cur, 0);
 	while (lip != NULL) {
 		if (lip->li_type == XFS_LI_EFI) {
 			efip = (xfs_efi_log_item_t *)lip;
@@ -2739,14 +2741,14 @@ xlog_recover_do_efd_trans(
 				 */
 				xfs_trans_delete_ail(mp, lip);
 				xfs_efi_item_free(efip);
-				spin_lock(&mp->m_ail->xa_lock);
+				spin_lock(&ailp->xa_lock);
 				break;
 			}
 		}
-		lip = xfs_trans_ail_cursor_next(mp->m_ail, &cur);
+		lip = xfs_trans_ail_cursor_next(ailp, &cur);
 	}
-	xfs_trans_ail_cursor_done(mp->m_ail, &cur);
-	spin_unlock(&mp->m_ail->xa_lock);
+	xfs_trans_ail_cursor_done(ailp, &cur);
+	spin_unlock(&ailp->xa_lock);
 }
 
 /*
@@ -3053,14 +3055,13 @@ xlog_recover_process_efis(
 {
 	xfs_log_item_t		*lip;
 	xfs_efi_log_item_t	*efip;
-	xfs_mount_t		*mp;
 	int			error = 0;
 	struct xfs_ail_cursor	cur;
+	struct xfs_ail		*ailp;
 
-	mp = log->l_mp;
-	spin_lock(&mp->m_ail->xa_lock);
-
-	lip = xfs_trans_ail_cursor_first(mp->m_ail, &cur, 0);
+	ailp = log->l_ailp;
+	spin_lock(&ailp->xa_lock);
+	lip = xfs_trans_ail_cursor_first(ailp, &cur, 0);
 	while (lip != NULL) {
 		/*
 		 * We're done when we see something other than an EFI.
@@ -3068,8 +3069,7 @@ xlog_recover_process_efis(
 		 */
 		if (lip->li_type != XFS_LI_EFI) {
 #ifdef DEBUG
-			for (; lip;
-			       lip = xfs_trans_ail_cursor_next(mp->m_ail, &cur))
+			for (; lip; lip = xfs_trans_ail_cursor_next(ailp, &cur))
 				ASSERT(lip->li_type != XFS_LI_EFI);
 #endif
 			break;
@@ -3080,20 +3080,20 @@ xlog_recover_process_efis(
 		 */
 		efip = (xfs_efi_log_item_t *)lip;
 		if (efip->efi_flags & XFS_EFI_RECOVERED) {
-			lip = xfs_trans_ail_cursor_next(mp->m_ail, &cur);
+			lip = xfs_trans_ail_cursor_next(ailp, &cur);
 			continue;
 		}
 
-		spin_unlock(&mp->m_ail->xa_lock);
-		error = xlog_recover_process_efi(mp, efip);
-		spin_lock(&mp->m_ail->xa_lock);
+		spin_unlock(&ailp->xa_lock);
+		error = xlog_recover_process_efi(log->l_mp, efip);
+		spin_lock(&ailp->xa_lock);
 		if (error)
 			goto out;
-		lip = xfs_trans_ail_cursor_next(mp->m_ail, &cur);
+		lip = xfs_trans_ail_cursor_next(ailp, &cur);
 	}
 out:
-	xfs_trans_ail_cursor_done(mp->m_ail, &cur);
-	spin_unlock(&mp->m_ail->xa_lock);
+	xfs_trans_ail_cursor_done(ailp, &cur);
+	spin_unlock(&ailp->xa_lock);
 	return error;
 }